I am flying into Boracay with my kites and board in a couple of weeks and noticed that both airlines that fly in there have a 10kg luggage limit. Anyone have any tips on to avoid excess baggae charges and how much do you end up getting stiffed in the end? Any advice is much appreciated...

Agreed... Don't worry about it.
I went in last year with 55kgs, delivering some equipment for a Bro.
Charges were next to nothing.
It was the poor baggage porter, who stuck my coffin bag on his head and ran up white beach off the boat, that I felt sorry for!!